Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 81Lecture #9 EGR 110 – Engineering GraphicsReading Assignment: Chapter I (Auxiliary Views) in Engineering Graphics Workbook, Series 1.2 (or Series 2)Sketching Assignment: Sketching Assignment #8Recall that we are currently studying various types of surfaces which are covered inthe chapters indicated below:•Chapter E – Normal Surfaces•Chapter F – Inclined Surfaces•Chapter G – Oblique Surfaces•Chapter H – Cylindrical Surfaces (today’s topic)We will also cover one additional chapter today:•Chapter I - Auxiliary Views2Lecture #9 EGR 110 – Engineering GraphicsAuxiliary ViewsMany objects have surfaces or features that are not normal (parallel) to one of the three principle planes of projection. Therefore the surface or feature will never be seen in True Shape (TS) in any principle view. For example, an inclined plane is never seen in TS. Auxiliary views are used to show such planes in TS. Auxiliary View – a view obtained by a projection on any plane other than a principle plane.Primary Auxiliary View – a view from a plane that has been projected from one of the principle planes but is perpendicular to only one of the principle planes. Folding line – a line between views that might be thought of as corresponding to a hinge in the glass box. See the following two pages for a comparison between a glass box containing only principle planes to one that contains an auxiliary plane.Reading Assignment: Chapter I (Auxiliary Views) in Engineering Graphics Workbook, Series 1.2Sketching Assignment: Sketching Assignment #83Lecture #9 EGR 110 – Engineering GraphicsPrinciple Orthographic Views - The “Glass Box”Recall how the concept of the glass box was used to illustrate the relationship between the six principle orthographic views (top, front, right side, left side, back, and bottom). Unfolding the box as shown below shows the proper orientation of the views. Reference: Page I-1 in Engineering Graphics Workbook, Series I, by Craig & Craig.4Lecture #9 EGR 110 – Engineering GraphicsAuxiliary Views - “The Glass Box”The modified glass box shown below includes a side of the box that is normal (parallel) to a plane of interest. Unfolding the box shows the proper orientation of the views.Reference: Page I-1 in Engineering Graphics Workbook, Series I, by Craig & Craig.5Lecture #9 EGR 110 – Engineering GraphicsExample: Principle orthographic views do not show certain features well. The block below has an inclined plane with three holes in it. Showing the location and size of the holes is awkward since the holes appear as ellipses and the inclined plane that is not shown in true size. An auxiliary view would be helpful in this case (see next page).Discuss how distances are transferred across folding lines.6Lecture #9 EGR 110 – Engineering GraphicsExample: (continued) The example on the last page has been modified to use an auxiliary view. Note that this view shows the inclined plane and the holes in true shape. The size and location of the holes are more easily shown using an auxiliary view. Discuss how distances are transferred across folding lines.7Lecture #9 EGR 110 – Engineering GraphicsExample: Work problem AUX-2 in Engineering Graphics Workbook, Series 1, by Craig & Craig.8Lecture #9 EGR 110 – Engineering GraphicsAuxiliary Views in Inventor: Creating auxiliary views in Inventor is easy. Instead of selecting Projected View to create a projection from an existing base view in a drawing file, select Auxiliary View (then select the edge view of the surface of interest) and drag the auxiliary view onto the drawing sheet. Try the example shown below. Note that the right side view shows the holes as ellipses, but they are in true shape in the auxiliary